Kallakorpi belonged to Matti Pietikäinen , Hemmo Silvennoinen and Eino Kirjonen of the Finnish "wonder team" that dominated the 3rd Four Hills Tournament in the winter of 1954/55 . Under coach Lasse Johansson, they had practiced a new style of jumping and no longer jumped with their arms stretched out like the rest of the field, but with their arms pressed against their bodies. In Oberstdorf, Kallaskorpi was level on points with Kirjonen and shared the day's victory with him; he also won the New Year's competition in Garmisch-Partenkirchen. In the overall tour, however, he was only third behind Silvennoinen and Kirjonen.